<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>


    var arr = [98, 31, 5, 27, 2, 78];
 for(var j = 0;j<arr.length-1;j++){
        for(var i = 0;i<arr.length-1-j;i++){
            if (arr[i]>arr[i+1]){
                var temp = arr[i];
                arr[i] = arr[i+1];
                arr[i+1] = temp;
            }
        }
 }

    console.log(arr);


</script>
</body>
</html>